Precious metal alloy composition



Patented Jan. 8, 1935 v v UNITED STATES PATENT OFFIC 1,987,452 morons mar. sum: oourosmon No Drawing. Application November 20, 1934, Serial No. 754,851

1 Claim. (CL 75-1) My invention relates to precious metal alloy Among the advantages or my alloy are the 10.1- compositions. It relates more. particularly to lowing: compositions 01' this character for use in wrought 1. It resists oral and atmospheric corrosion. and cast dental work and for use in manuiactur- 2. It melts smoothly and casts easily.

5 ing jewelry. An object of the invention in general 3. It is lighter in weight than the conventional 5 is to produce an alloy which has distinct advandental casting, gold alloys. tages ior'such uses and an object in particular is 4. It is of pleasing color. to improve on the composition disclosed and 5. The melting range is in the-same temperaclaimed in my Patent No. 1,965,012, issued July 3, time range asthat of gold alloys commonly used 1934, I in dentistry and is considerably lower than that 10 The full objects andadvantages of my invenoi the alloy disclosed in my prior patent above tion will appear in connection with the detailed referred to. description thereof and the novel features oi! the The use of indium is oi. particular importance invention will be particularly pointed out in the in controlling orv improving color, corrosion rel sistance, melting range, hardness, and strength. 15

In carrying out my invention, I utilize the 101- The use of platinum is of importance due to the lowing elements combined in proportions by fact that it assists in controlling the grain struc- NORRIB O. TAYLOR.

weight within the following ranges: ture of the composition so that the material may Per cent be more readily rolled and drawn. Gold zstoss i mum 2 to precious metal alloy composition compoud of Silver H033 from 25 to 0! gold, from 2 to 25% of pallacopper 10w dium, from 10 to 33% oi. silver. from 10 to 25% mdmm %to5 otcopper,trom%to5%oiindium,andiromt 25 Platinum e y 10 to 10% 01 platinum. 25 

